ALISON NOON/For The tribune
Rooney Petroleum Services employees Alex Borja, left, and Dylan Haggerty look toward the natural gas flare that has burned 24/7 on their well location for nearly two weeks, one of their biggest responsibilities as night operators. The coworkers supervise the site in northern Colorado near Ault, about 40 minutes northeast of Greeley, from 6 p.m. to 6 a.m. five days a week, they said.

ALISON NOON/For The Tribune
Oil and gas companies' use of natural gas flares could be affected by a new liquefied natural gas facility being built near Keota northeast of Greeley. Noble Energy and the Center for Liquefied Natural Gas said that the facility will lower the amount of gas flared, but that, at this time, the cost of the system inhibits completely replacing gas flares with liquefaction in oil fields.